.bg {
    width: 100%;
    height: 100%;
    position: fixed;
    background-repeat: no-repeat;
    background-position: 0px 0px;
    background-size: 100% 100%;
}

.index {
    position: relative;
}

.stack {
    position: absolute;
}

.container {
    padding: 10%;
    width: 100%;
    height: 100%;
}